Electric-arc lamp.



J. C. LINCOLN.

ELECTRIC ARG LAMP.

Arrmcnmn FILED un. 15, 1905.

Patented July 2, 19121 3 BEEBTB-8HEET 1.

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ELECTRIC ARG LAMP.

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UNITED sTATEs PATENT oEEicE.

SOHN C. LINCOLN, OF CLEVELAND, OHIO, lASSIGI'Q'OR. TO THE LINCOLN COMPANY, OF

CLEVELAND, OHIO; A;'CORPORATION 0F OHIO.

Cuyahoga' and Atate of Ohio, have invented 'certain new alii useful Improvements in Electric-Arc. Lamps, of which the following is a specification,

My invention relates to improvements in electric are lamps, and hasfor its object, the provision of a, structure of extreme simplicity; combined with highetliciency and durability in operating the lamp. S In structures of this character, the reduction of the. several parts to a minimum, is not only desirable on account of reducing the chances for the lamps to get out. of order, but because of the greater economy secured in building such'lamps. Efforts directed along similar lines have not infrequently resulted, however, in the production of a more or less complex or impractical lamp structure, and, accordingly, I have devised one providing direct and immediateadjustment of the upper and movable carbon, in connection with positive means for 'producing a substantially constantl ticld for regulating such adjust ment. Briefly referring to such means, I may state that they comprise a structure, wherein the traveling armature which car ries the upper carbon, is equipped with contat-.ts adapted automatically to maintain in circuit a predetermined number of turns or windings ot the field coils1 whereby a substantially constant pull or lifting effec-t is cured. Thus, in the structure which I shall presently describe, the field-coil is seen to comprise windings with which the traveling armature is adapted tomalce contact, thus including a definite number of turns or windings thereof in any of its positions of ad justmcnt whereby current is supplied theretoand which exerts the requisite and substantially constant lifting eti'ect.

Specific reference to this structure. as depicted in the accompanying drawings, will make my invention much more readily un,

dersl ood, in which dra\viugs;-

Figure I., is a view in elevation of a lamp designed for use upon constant potential cir cuits, and including or employing my invention; the said figure being partially broken away in order to illustrate the `interior construction. Fig. Il., a vertical sectional view of the said lamp. Fig. III., is

A Specication of Letters Patent.

. Application tiled March 15, 1905.

Patented July 2, 1912. serial No. 250,217.

a transverse section of a lamp of somewhat modified construction, and is adapted for use upon constant currentI circuits. -Fig. I-V., is a transverse section on line IV.-IV., through the arc-lamp and the armature thereof. Ifig. V., shows/the blank for forming a moditied type of armature. Fig. VI., is an enlarged detail showing the construction of the field windings, whereby the magnetic flux is facilitated; Fig. VII., is an enlarged detail illustrating the segmental form of armature. Flig. VIII., is an enlarged fragmentary view in cross-section, illustrating the details of the field construction with the` windings contacting interiorly and exteriorly with the adjacent flanged rings. F ig. IX., is a diagram illustrating the electrical relation of the members oflny imprm ed arc lamp; and Fig. X., is a plan view showing the improved dainpin device.

Throughout each o the several figures of the drawings, I have employed the same character of reference to indicate similar parts, in order to obviate any confusion.

The outer casing a of the lamp, Serves as ay return magnetic circuit for the lield-windings, being ormed of an iron tube or Shell adapting it for this purpose. Positioned within the casing, are the two conducting rods I, c, which respectively carry current to the armature, field-windings, and upper carbon, and from the lower carbon to the external circuit. The rod c is serrated, and

cooperates with the checking or damping de vice, in a manner which I shall later eX- plain. therefrom, and from each othelgare the field-coils or windings d, a given section or XVithin the casing a, but insulated portion of which is excited to provide the magnetic Field for supporting the armature c, and the upper carbon" f of the lamp. This coil is formed of flat copper wire, of which the turns are respectively insulated 'from each other, while affording an annular S face for contact with the co-acting ringsca ried upon the armature. -The said armature is provided with an upper contact ringfe connecting with the contact rod c, and cir-` cumferentially with the field-windings d, while a lower contact ring e2 is electrically connected with the tubular iron armature, and, through the medium of the same, with theI upper carbon-holder f. This structure accordingly, insures a constant numberof excited turns in the field-windings during between the upper and lower contact rings upon the armature.

lt will be observed that the tubular iron armature annularly recessed or eut away, for the purpose of increasing the air-gap midway thereof. and preventing, as far as |'mssible. the. sliorlwircuiting or closure of the lines of force within the area of the excited portion of the i :l.l-\\'ir1(lixigs.

Vlivotally mounted upon a fiber block gv is the weighted leven/i and its detent L', which engage the serrations or teeth provided upon the rod rn. This construction, it will be seen, serves a check to prevent the Isudden movement of the arn'iature, and the upper carbon, since the intent or escapement will'allernately engage at its upper and lower end,qthe teeth upon rod c, thus causin f the weighted lever to oscillate or rock bac and forth and check any tendency of the parts to sudden increment. This construction, accordingly, subserves the purpose of a dash-pot, and opposes the sudden actuation of the movable parts in the well known manner.

The lower carbon z' of the lamp, is carried within its holder at the end of rod c,

and within the inclosing globe is, while al larger globe Z may be disposed about the arc and its inclosing globe, if desired.

In the structure of FigIII., an armature is formed of a plurality of insulated sheet iron segments, well shown in Fig. VII., and carries midway a fine wire coil m, which is in shunt relation with the arc, thus adapting the structure for use upon constant current circuits. The form of armature is one capable of l'ieingconst-ructed of cxtreinely light weight, which is very desirable in a lamp of this character. The blanks n, Fig. V., which are folded to form thearmature, are provided with a central opening n', which serves to carry the body of magnetic material away, fromI the field-wind it, which readily adjusts itself tothe posii tion of the armaturetlzrougliout its path of moi/ammi, and serves to Supply current to the uplpcr Contact ring and upper portion of the fie d coil 'in circuit therewith.

En: the purpose of reducing the Iresistance to the passage of the magnetic lines of force generated by the field-coils, I havel also provided a modified type of field struc ture, best shown in Figs. III. and VI. In this structure,'annular iron flanged-rings p' arc provided, which exteriorly lservevas electrical conductive segments for making contact with theennducting rings of the armature, and form ehannels'wherein the windings of the field structure are adapted to be positioned. The field-windings are subdivided. being formed of flat insulated wire wound within the said flanged-rings. This field structure, in consequence, affords a better path fonthe flow of magnetic lines to the exterior casing a, since the said'sheet iron flanged-rings 7; almost entirely close the circuit within `the said casing. The armature, it should be observed, is sorconstructed and positioned as to afford a gradually receding body of metal midway of its'y length, which magnetic body abruptly approaches the channel-rings in a position adjacent to the lower contact ring of the armature. The other features of the lamp shown in Fig. lll., will be readily understood by making reference to the foregoing description of the first type of lamp.

Having considered the above, one may readily understand the manner in which my improved lamp operates. In the structure described, it is obvious that only the section of the field coil or winding which is spanned by the armature, and embraced between the upper and lower contact rings thereof, will be excited, and, in consequence, the magnetic pull or lifting effect is the same in all positions of the armature and its connected carbon-holder and upper carbon. The lines ofzforce generated by the exciting current; will find a path through the external casing ture, which is so esignedmnd yproportioned as to cause as many as possible' of 4said lines of force to close or nd .return circuit through the body of the armature b elow'the lower contact ring. This, necessarily, pro- (luces a field of force wherein the amature and its connected parts willbe supported or floated in thc requisite position of adlustment. It t e arc is lengthened beyond the normal, ho,l ever, the flow of current 1n the windings, which are serially connected therewith, is correspondingly reduced, and the armature descends; while a shortening of the arc increases the flow of current and floats the armature a little higher in the lamp, in order to reestablish the normal arc. Going a little further into the explanation of this action, I may say that the pull or lifting-effect' may be said to be approximately. equal to Ythe strength ofthe field multiplied by the currentgand, im consequence, the increase ordner-case 1n vthe flow 'of auch currnt,-`restxlt `m an incifease or -.a, and back throudgh the body of the armadecrease in the lifting-eiect out of exact proportion thereto, and the adjustment is thereby made ver sensitive and eicient.

The function o the fine wire s/hunt coil m is well known; the same merely serving to vantageously ositioned for electing the ad justment of t e upper carbon.

I am aware that the invention herein disclosed is capable of considerable modification, as embodied in working structures, and

I claim as-my invention, and desire to secure by these Letters Patent, the follow- 1ng:

1. In an adjustment for electric arc lam s,

the combination with a serrated rod, o a

support for the movable carbon of the lamp and a weighted escapement thereon engag-- ing.' the serrated .rod'and adapted to check the'sudden movement of the movable carbonsupport, substantially as set forth.

2. In an electiic Aarc lamp, the combination with a field structure, of a traveling armature therein, a carbon supported there' kit by, and a stationary co-acting carbon; said armature comprising sheet iron sections exteriorly expanded and centrally cut away to provide a median recess, and a substantially uniform path for the ma etic lines, the sections bei-ng at-ially fo ded upon `themselves and insu ated, and retaining members for securing the sections together, substantially as set forth.

3. In an electric arc lamp, the combina tion with a field structure comprising annular fianged members of sheet iron, an ex' terior casing of iron adjacent'theretmsectional field windings disposed between theannular members, a traveling armatune interiortlylpositioned within the eld structure, provi e with contacts for enga the annular members; the said armature ing formed of sheet iron senents centrally 'cut away but roviding'su stantially uniform. paths for t e passage of magnetic lines, an'

up r carbon supported by the armature,` an a stationary co-acting lower carbon, subf stantiall as set forth.

Sign at Cleveland, this 13th day of March, 1905, in the presence of two subscribing witnesses. .f

JOHN C. LINCOLN'.

Witnesses:

JOHN F; MoDoNNELL, ALBERT LYNN LAWRENCE. 

